<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像框 -->
      <div class="avatar_box">
        <img src="../assets/logo.png" alt="" srcset="" />
      </div>
      <!-- 登录表单-->
      <el-form
        :model="loginForm"
        :rules="loginFormRules"
        ref="loginFormRef"
        label-width="0px"
        class="login_form"
      >
        <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input
            v-model="loginForm.username"
            prefix-icon="iconfont icon-user"
          ></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop="password">
          <el-input
            v-model="loginForm.password"
            type="password"
            prefix-icon="iconfont icon-3702mima"
          ></el-input>
        </el-form-item>
        <!-- 按钮 -->
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  data () {
    return {
      // 登录表单的数据绑定对象
      loginForm: {
        username: 'admin',
        password: '123456'
      },
      // 表单验证规则对象
      loginFormRules: {
        username: [
          { required: true, message: '请输入登录名称', trigger: 'blur' },
          { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
        ],
        password: [
          { required: true, message: '请输入登录密码', trigger: 'blur' },
          { min: 3, max: 15, message: '长度在 3 到 15 个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    // 点击重置按钮,重置登录表单
    resetLoginForm () {
      // 拿到表单引用对象,重置
      this.$refs.loginFormRef.resetFields()
    },
    login () {
      // 拿到表单引用对象 表单预验证
      this.$refs.loginFormRef.validate(async valid => {
        if (!valid) return
        // 利用await简化promise操作，前提是方法需要设置为async异步
        const { data: result } = await this.$http.post('login', this.loginForm)
        if (result.meta.status !== 200) return this.$message.error('登录失败')
        this.$message.success('登录成功')
        console.log(result)
        // 将登陆成功之后的token保存在客户端 ，保存在sessionStorage中表示在整个会话期间，
        // 不保存在localStorage中，这个表示持久化存储
        window.sessionStorage.setItem('token', result.data.token)
        // 登录成功，页面跳转
        this.$router.push('/home')
      })
    }
  }
}
</script>

// 开发依赖安装less-loader less
<style lang="less" scoped>
.login_container {
  background-color: #2b4b6b;
  height: 100%;
}
// 头像框
.login_box {
  width: 450px;
  height: 300px;
  background-color: #ffffff;
  border-radius: 3px;
  // 放置盒子在正中央
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  .avatar_box {
    width: 130px;
    height: 130px;
    border: 1px solid #eee;
    border-radius: 50%;
    padding: 10px;
    box-shadow: 0 0 10px #dddddd;
    position: absolute;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: #ffffff;
    img {
      width: 100%;
      height: 100%;
      border-radius: 50%;
      background-color: #eee;
    }
  }
}
.login_form {
  position: absolute;
  bottom: 0;
  width: 100%;
  padding: 0 10px;
  box-sizing: border-box;
}

.btns {
  display: flex;
  justify-content: flex-end;
}
</style>
